LaMotte 1200 Colorimeter - Manual (Page 30)

CHLORINE TEST PROCEDURE - DPD METHOD
Read the 1200 Colorimeter Manual before proceeding. Carefully
wipe tubes dry before inserting into the colorimeter chamber.
FREE AVAILABLE CHLORINE
7. 8.
5.
3.
1. 2.
4.
6.
I200
COLORIMETER
••••••••••••••••••
READ
READ
ZERO
CAL
••••••••••••••••••
bla
COLORIMETER
I200
Fill the Water
Sample Collecting
Bottle (0688) with
sample water. This
will be used to
dispense sample
water for the tests.
Insert the tube
into the
chamber, being
sure to align the
index line with
the arrow on
the meter.
Close the lid.
This tube is the
blank or zero.
Empty all but a few
drops of sample from
tube. Add one
*Chlorine DPD #1
IG Tablet (6903A) and
crush with tablet
crusher (0175).
NOTE: To insure
accurate results, tablet
must be crushed before
filling tube.
Align the index line with the
arrow on the meter, insert tube
into chamber.
the lid. Push the
READ button.
Record results as
ppm Free Available
Chlorine. Save
sample for the Total
Residual Chlorine
test.
Rinse and fill a
colorimeter tube
(0290) to the
10 mL line with
sample water.
Cap and wipe
dry.
Push the READ
button to turn the
meter on. Press the
ZERO button and
hold it for 2 seconds
until is displayed.
bla
Release the button to
take a zero reading
(0.00 ppm).
Fill to 10 mL line
with sample. Cap
and mix until tablet
disintegrates. Make
readings within 30
seconds after
disintegration of the
tablet.
Add one Chlorine
DPD #3 IG Tablet
(6197A) to the sample
from Step 6. Crush
tablet.
READ